831145389 has 4 divisors (see below), whose sum is σ = 1108193856. Its totient is φ = 554096924.

The previous prime is 831145387. The next prime is 831145391. The reversal of 831145389 is 983541138.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (831145387) and next prime (831145391).

It is a cyclic number.

It is not a de Polignac number, because 831145389 - 2¹ = 831145387 is a prime.

It is a super-2 number, since 2×831145389² = 1381605315311922642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 831145389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (831145387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138524229 + ... + 138524234.

It is an arithmetic number, because the mean of its divisors is an integer number (277048464).

Almost surely, 2^831145389 is an apocalyptic number.

It is an amenable number.

831145389 is a deficient number, since it is larger than the sum of its proper divisors (277048467).

831145389 is a wasteful number, since it uses less digits than its factorization.

831145389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277048466.

The product of its digits is 103680, while the sum is 42.

The square root of 831145389 is about 28829.5922447752. The cubic root of 831145389 is about 940.2117332757.

The spelling of 831145389 in words is "eight hundred thirty-one million, one hundred forty-five thousand, three hundred eighty-nine".